J-B Weld Ultimate Grey Gasket Manufacturer and Sealant is an RTV (Room Temperature Vulcanized) Silicone gasket material designed for use in mechanical assemblies where higher torque or close-range bolt profiles can lead to higher loads and cause gasket and sealing errors for average silicones.

During curing caused by exposure of the product to moisture in the air, silicone forms a hard, waterproof seal and seal on most surfaces.

Does not shrink or crack, is resistant to oil and petroleum products, weather resistant, sensor safe, has good temperature resistance up to 500º F and is great for many automotive applications